added release number

Author: jordancormack

README.md

@@ -676,7 +676,7 @@ User can add a STM32 based board following this [wiki](https://github.com/stm32d
 | Status | Device(s) | Name | Release | Notes |
 | :----: | :-------: | ---- | :-----: | :---- |
 | :green_heart:  | STM32L412K8<br>STM32L412KB<br>STM32L422KB | Generic Board | *2.0.0* |  |
-| :yellow_heart:  | STM32L431CB<br>STM32L431CC | Generic Board |  |  |
+| :yellow_heart:  | STM32L431CB<br>STM32L431CC | Generic Board | **2.8.1** |  |
 | :green_heart:  | STM32L431RB<br>STM32L431RC | Generic Board | *2.3.0* |  |
 | :green_heart:  | STM32L432KB<br>STM32L432KC<br>STM32L442KC | Generic Board | *2.0.0* |  |
 | :green_heart:  | STM32L433CBT<br>STM32L433CCT | Generic Board | *2.1.0* |  |